Activate Gyre Sage by tapping it, adding at least {G}{G}{G}{G}{G}.
Activate Staff of Domination's third ability by paying {3} and tapping it, untapping Gyre Sage.
Activate Staff of Domination's first ability by paying {1}, untapping it.
Repeat.
Once you have infinite mana, you may use it to activate Staff of Domination's other abilities.

Infinite card draw

Infinite draw triggers

Infinite green mana

Infinite lifegain

Infinite lifegain triggers

Infinite untap of creatures you control

Gyre Sage

Staff of Domination

Activate Gyre Sage by tapping it, adding at least {G}{G}{G}{G}.
Activate Gyre Sage by paying {3} and untapping it, giving it +2/+2 until end of turn.
Repeat.

Infinitely large Gyre Sage until end of turn

Umbral Mantle

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